Improvement in grinding-machine



'tatami JOHN L. Oris; or LEED-S, MASSACHUSETTS.

l LettcrsPatent No. 83,405, dated October 277, 1868. I

I MPnovnMENT IN @mme-mesme.

` Vl'he Schedule referred tov inv these Letters Patent and making part of thesame.

To all whom it may concern.

Be itknown that I,'JOHN L. O'rrs, of Leeds, in the county .of Hampshire, and- State of Massachusetts', have invented certain new and useful Improvements 1n GrindlnglMachiues; and I do hereby declare the following to be a full, clear, and exact'description of the same, reference beinghad to the accompanying drawings, vmaking a part of this specification, in which- Figure 1` represents a perspective view of the inachine;

Figure 2 represents a vertical section through the same.

Figure 3 represents a section through the feedingcarriage, and showing most of the feeding-mechanism. Similary letters of reference, where they occur in the separate tigures, denote like parts of the machine in all of the drawings.

I am aware that there are many grinding-machines in which the tool to be `ground is clamped in a piece or frame, and moved across or past the face of the grinding-wheel; but in machines heretofore constructed for this purpose, the wheel or grindstone is made to revv,olve on its axis, in a stationary position, whilst the tool or article to be operated on is passed along its face. This gives to the edge of `the knife or other thing being ground the form of a segmennt of a circle, corresponding ,with the circumference of the stone orl wheel used,

making the edge very thin and liable to break fwhen a small wheel or stone is used; and to avoid this, wheels or grindstones of very large diameter had to be used to give a proper shape to the edge of -'the implement ground.

My invention consists in attaching an emery-wheel/ or grinding-stone of any kind to anla-rm or arms, which is caused to vibrate, oscillate, revolve, or roll 'en a'centre, remote from the centreof` said wheel or stone, whilst the tool or implement being ground is passed across `its face, thereby making the edge of the tool more or less concave,according `to the length of the arm or arms, to which the wheel or stone isattached, and not defined by the radius of said wheel or stone, or, in other `words, .so that a concave of large radius may be formed by avery small wheel, and thus making a much better edge to cutting-knives of anyykind.

And my invention further consists in the combina tion of devices for feeding the clampingbar and the tool to be ground past `theface of the grindstone or ,emeryavlieel. l y n Io enableothers skilled in the ait to make and use "my invention, I` will proceed to describe the same by reference to the drawings, first premising that though I have mentioned the einery-wheel or grindstone as hung and operated in the vibrating arms or frame, it .will be obvious to any mechanic that the clampingframe may be thus `hungand vibrated whilst the wheel Y.or stone revolves iniined` bearings, and thus produce `precisely thesame eect by preciselythe same means, andwould `be the same invention, and so `regarded by me. l .1

Aother moving parts of the machine.

On this shaft B, lfor convenience of construction and.

operation, is hung a frame, C, which can vibrate on said shaft as a centre, and to the forward end of this frame is hung an emerywheel or grindstone, D, by its shaft E, said shaft being revolved by the main shaft B, through an endless belt or band, a, passing over and around the pulleys F G, one on each of said shafts.

A second endless belt orband, b, passes from a pulley, H, on the shaft B, to and around Aa pulley, I, on a shaft, J, hung to the main frame underneath the Shaft of the wheel or stone D, and to a crank or wrist-wheel, K, on the shaft J.

A pitman, 0 extends up, and is connected to the frame O, so that as the wheel or stone is revolved in said vibrating fram'e, the latter is vibrated up and downr v by the pitman-*connection c, and so that said stone or wheel has two motions, viz, one around its own shaft J, and the other around the shaft C.

Iwo bent arms, L L, pivoted or otherwise fastened to the main frame, as at d, fig. 2, project forward, and form a support for the 'table M, upon which is placed acarriage, N, that can be moved in and out by a setscrew, O, whilst it is guided in ways, P, on the table.

. In arms Q Q, on the carriage N, (said arms being hung o`n a rod or through bolt 6,) is placed a clampingdevice, R, for holding the knife S, or other article to be y U, having ratchetteeth, h i, in it, which teeth incline in diii'erent or opposite directions from the centre of said plate. v Y

A spring-arm, j, extends from a block,V, which is fast on or a part of the carriage N, to about the centr'e of the table, or of the wheel or stone` D, and between the two; and to this spring-'arm is/pivoted a reversible dog or pawl, lc, which takes into o ne or the other of the sets of ratchet-teeth hfi, as the case may be, and feeds said ratchetfplate U along on its ways T.

To the swinging frame there is attached an arm, Z, which, every time the frame swings down, strikes against the spring-arm j, and presses it down, and causes the pawl It to act and move the ratchet-plate one notch. As the frame ascends, the spring-arm j reacts,and brings vthe pawl into position for` another feeding-motion, when the frame again descends.'

. `On each end of the clamping-ame or device, R, there is a hinged arm, m, which, when thrown down, comes within the path ofthe ratchet-plate U, and when groundwith it.

When the arms mare swung up .or back, clear of Y ratchet-teeth, and the swing-frame is up to its highest point, or practically so, the spring-arm j can be raised up, the paw] k reversed or swung in anopposite direction, and it will then feed the plate the other way, and

so on.

As before stated, it is obvious that if the shaft of the Wheel or stone were revolved iu fixed bearings, and/ the clamping-bar R were hung in a iame or arms vibrating around the shaft B, or other remote point om the griudstone in that direction,land the clamp and article to be ground were thus moved past the stone, the same result would be attained, that is,a concave or segment of a very large circle would be ground, however small the grinding-stone or wheel might be.

The arms L, to which the table, carriage, clamp, and ratchet-plate are all united, as also the article to be ground, when in the clamp or holder, are pivoted to the main frame by the screws or pivots d, and the whole may be Vibrated on said pivots during the process of grinding; or they may be properly adjusted, and when so held in that position, by'pins passing through holes in said arms and into the main frame,'or other known holding-devices.,

Having thus fully described my invention,

l What I claim therein as new, and desire to secure Yis remote from the centre of motion of the wheel or stone, for the purpose of grinding the tool or implement on a concave from a greater radius than that of "the stone or wheel, substantially as described.

Also, the feeding along of vthe tool or article to be ground, past the face of' the Wheel or grindstone, by

means of the vibrating frame, reversible pawl, and its spring-arm orl support, and the Aratchet-plate, acting together in the manner and for the purpose described.

J. L. OTIS. Witnesses L.'DIMocK, GEORGE'H. RAY. 

